Electro-Proportional Valves — Pressure Control

TS12-27 — Proportional Pressure Control, Pilot-Operated Relief

DESCRIPTION
A screw-in, cartridge-style, pilot-operated, hydraulic pressure relief valve, which can be
infinitely adjusted across a prescribed range using a variable electric input. Pressure output
is inversely proportional to DC current input. This valve is intended for use as a pressure
limiting device in demanding applications, and is ideal for hydraulic fan drive applications.

OPERATION
The TS12-27 blocks flow from 1 to 2 until sufficient pressure is present at 1 to open the pilot
section by overcoming the induced spring force. With no current applied, the valve will relieve
at maximum set pressure. Applying current to the coil proportionally decreases the pressure
required to open the valve from 1 to 2.Note: This valve is ideal for hydraulic fan drive applications. Consult factory for electronic
controllers specifically designed for fan drive applications.

* Note: For F, the Control Current Range for E-coils is 1.4 to 0.9 amps for 12 VDC and 0.7 to 0.45 amps for 24 VDC. Coil Resistance for 12 VDC is 7.32 ±5% and 29.4 ±5% for 24 VDC. Consult factory for detailed current range for particular pressure setting.Recommended Drivers: Dither Frequency: 200 HzPWM Frequency: 200 HzTemperature: -40° to 100°C (-40° to 212°F) with Buna seals;
-26° to 204°C (-15° to 400°F) with fluorocarbon seals;
-54° to 107°C (-65° to 224°F) with polyurethane sealsFiltration: See page 9.010.1Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1Installation: When possible, the valve should be mounted below the reservoir oil level.
This will maintain oil in the armature preventing trapped air instability.
If this is not feasible, mount the valve horizontally for best results; See page 9.020.1Cavity: VC12-2; See page 9.112.1_2wCavity Tool: CT12-2xx; See page 8.600.1Seal Kit: SK12-2x-B; See page 8.650.1Coil Nut: 4540550